Halo 5 Forge Multi/Message Power command help

I’m making a map called IX where covenant corpses are the zombies it’s a remake from bo4 and so far it’s going great I just have one small problem. Basically I have a little secret where there’s 4 toys you shoot outside the map (I set it up with invisible targets) and basically every target you shoot sends a message to alpha and I have 4 grenades that are supposed to spawn in when you shoot all 4 toys and I set it up where the grenades have a multi/message power command that is set up trigger counts 4 and the first one is message received aplha and the rest are none but when I shoot all 4 they don’t spawn. Can anyone please help

Invisible targets don’t seem to work for some reason…